<template>
	<view>
    <my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh + 'px'}">

        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChange(i)">
            {{item.cat_name}}
          </view>
        </block>

			</scroll-view>
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="right-scroll-view" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
				  <view class="cate-lv2-title">
				    / {{item2.cat_name}} /
				  </view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
				</view>
			</scroll-view>
			
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
			};
		},
		onLoad(){
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight -50
      
      this.getCateList()
		},
    methods:{
      async getCateList(){
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        
        this.cateLevel2 = this.cateList[0].children
      },
      activeChange(i){
        this.active = i
        
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 0.01 : 0
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
		.left-scroll-view{
			width: 120px;
			.left-scroll-view-item{
				line-height: 60px;
				text-align: center;
				background-color: #f7f7f7;
				font-size: 12px;
				
				&.active {
					background-color: #ffffff;
					position: relative;
					
					&::before{
						content: '';
						width: 3px;
						height: 10px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
			
		}
    .cate-lv2-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .cate-lv3-list{
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item {
        width: 33.33%;
        margin-bottom: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
        
        image {
          width: 60px;
          height: 60px;
        }
        
        text{
          font-size: 12px;
        }
      }
    }
		
	}
</style>
